Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4481cd28ef13f1…

MALICIOUS

PDF

45.9 KB Created: 2020-09-05 14:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 403619941757146d37e987df2d895036 SHA-1: 98429288403b8679a1cdb8acbbb43a14accb87bc SHA-256: de4481cd28ef13f137ba7dc7656721a31a7f6349a35c35e934091609d73c95f2
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, which is the primary indicator of malicious intent. The document body, though heavily obfuscated, contains the same malicious URL. The presence of numerous embedded links, many pointing to external PDFs, further supports the classification as a link farm, often used to obscure malicious destinations. The primary malicious URL is https://ttraff.link/wix?keyword=khurana+anatomy+and+physiology+of+eye+pdf.

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.link/wix?keyword=khurana+anatomy+and+physiology+of+eye+pdf
    • https://static.usrfiles.com/ugd/a891c0_163c4a115d0b4421bf58b6750fdc2fa2.pdf
    • https://static.usrfiles.com/ugd/87a178_01e75ac308544bff89973be4809e1db3.pdf
    • https://static.usrfiles.com/ugd/0df15e_94587a96661b4b92b80b8f9b03f4ec6f.pdf
    • https://cdn.shopify.com/s/files/1/0434/4456/8220/files/xaxomu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7517/3528/files/25856238015.pdf
    • https://cdn.shopify.com/s/files/1/0438/4253/5574/files/zisowobevugabonudiwexi.pdf
    • https://cdn.shopify.com/s/files/1/0436/8351/2473/files/tibixapiruvuwobifexof.pdf
    • https://static.usrfiles.com/ugd/5dc3ca_28e941a6e7724240b02d164bf25d7937.pdf
    • https://static.usrfiles.com/ugd/ae15ca_20ae2e69fb094fb9b2aa165cf622f6ca.pdf
    • https://static.usrfiles.com/ugd/fa6f14_f8492ebb17e34b9289b143e67d434ed5.pdf
    • https://static.usrfiles.com/ugd/934fc3_f871dc4c93ad451296e194824055c7eb.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076fb.bin
bae2c59e35721b2baabcd88bfda0e42d32aa694d542b86ed4aa9dec87ae8d8b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76FB 5524 bytes
font_01_sfnt_off000089a8.bin
4cefb0db0e77d34e78e973cf178572d0e1e9c8892ae3be0c05f0552839734f51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89A8 9748 bytes

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